초록 ▼

A method for removing biodegradable compounds selected from the group comprising: phenolics, free and fixed ammonia compounds, thiosulfates, cyanides, thiocyanates, sulfides and the like from a feed wastewater. The method comprises the steps of treating the feed wastewater by adding soda ash thereto

A method for removing biodegradable compounds selected from the group comprising: phenolics, free and fixed ammonia compounds, thiosulfates, cyanides, thiocyanates, sulfides and the like from a feed wastewater. The method comprises the steps of treating the feed wastewater by adding soda ash thereto; and further treating the wastewater by means of an activated sludge treatment in a sludge reactor to reduce the level of biodegradable compounds in the wastewater. A method for removing biodegradable compounds selected from the group comprising phenolics, free and fixed ammonia compounds, thiosulfates, cyanides, thiocyanates, sulfides and mixtures thereof from a feed wastewater comprising the steps of: treating the feed wastewater with an inorganic carbon source; and further treating the wastewater by means of a single-stage activated sludge treatment in a sludge reactor to reduce the level of said biodegradable compounds in the wastewater. An apparatus for treating a wastewater containing biodegradable compounds including free and fixed ammonia. The apparatus comprises an ammonia still for removing free and fixed ammonia; a source of soda ash solution; and means connected to the source of soda ash solution for feeding soda ash solution from the soda ash source to the ammonia still to decompose the fixed ammonia in the wastewater. The apparatus further comprises a single-stage activated sludge reactor for treating the wastewater to reduce the level of biodegradable compounds in the wastewater.

대표청구항 ▼

A method for removing biodegradable compounds selected from the group comprising: oils, volatile organics, phenolics free and fixed ammonia compounds, thiosulfates, thiocyanates, cyanides, sulfides and the like from a feed wastewater comprising the steps of: (a) distilling said wastewater to remove

A method for removing biodegradable compounds selected from the group comprising: oils, volatile organics, phenolics free and fixed ammonia compounds, thiosulfates, thiocyanates, cyanides, sulfides and the like from a feed wastewater comprising the steps of: (a) distilling said wastewater to remove said free ammonia compounds, oils and volatile organics; (b) adding soda ash to said wastewater and steam distilling said wastewater to remove said fixed ammonia compounds; (c) treating said wastewater of step (b) by means of an activated sludge treatment in a single stage sludge reactor comprising biological solids, said solids reactor further comprising particulate solids selected from the group comprising clay, fly ash, powdered activated carbon, or the like adapted to improve the settling characteristics of said sludge and running said reactor at a solids retention time of about 100-1000 days, said activated sludge exhibiting substantially no net biological growth to produce an effluent comprising biological and particulate solids; (d) separating said biological and particulate solids from said solids containing effluent of steps (c); and (e) recycling substantially all of said separated solids from said settling tank to said activated sludge reactor whereby substantially no solids wasting occurs.